期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 13, 期 23, 页码 5316-5323出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c01186
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资金
- Australian Research Council (ARC) Discovery Early Career Researcher Award Scheme [DE220100846]
- ARC Laureate Fellowship Program [FL210100180]
- National Natural Science Foundation of China (NSFC) [61729501]
- Major International (Regional) Joint Research Project of NSFC [51720105015]
- Science and Technology Innovation Commission of Shenzhen [KQTD20170810110913065]
- Australia China Science and Research Fund Joint Research Centre for Point-of-Care Testing [ACSRF658277, SQ2017YFGH001190]
- Australian Research Council [FL210100180, DE220100846] Funding Source: Australian Research Council
This study provides a quantitative guide for designing high-brightness UCNPs under different excitation conditions, including the optimum concentrations of sensitizer and emitter ions, and the impact of different concentrations on brightness and NIR/blue ratio.
Lanthanide-doped upconversion nanoparticles (UCNPs) have enabled a broad range of emerging nanophotonics and biophotonics applications. Here, we provide a quantitative guide to the optimum concentrations of Yb3+ sensitizer and Tm3+ emitter ions, highly dependent on the excitation power densities. To achieve this, we fabricate the inertcore@active-shell@inert-shell architecture to sandwich the same volume of the optically active section. Our results show that highly doped UCNPs enable an approximately 18-fold enhancement in brightness over that of conventional ones. Increasing the Tm3+ concentration improves the brightness by 6 times and increases the NIR/blue ratio by 11 times, while the increase of Yb3+ concentration enhances the brightness by 3 times and only slightly affects the NIR/blue ratio. Moreover, the optimal doping concentration of Tm3+ varies from 2% to 16%, which is highly dependent on the excitation power density ranging from 10(2) to 10(7) W/cm(2). This work provides a guideline for designing bright UCNPs under different excitation conditions.
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